<div *ngIf="hero">
  <button (click)="goBack()">go back</button>
   <h2>
      {{hero.name | uppercase}} Details
   </h2>
   <div><span>id:</span>{{hero.id}}</div>
   <div>
      <label>
         name:
         <input [(ngModel)]="hero.name" placeholder="name">
      </label>
   </div>
   <button (click)="save()">save</button>
</div>
